What's the purpose of it? I see it comes with the kit but I picked up some BC coilovers and it didn't have it with them. Do I need them?

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Adjustable units are stronger, and allow you more flexibility/options when mounting the link to the bar and strut. I mounted my links on the back-side of the sta-bar for clearance; this would have been impossible with OEM links:

More than likely you’ll be ok with OEM links if you have the stock front sway bar. But, if your package was supposed to come with them, then I would insist on getting them out of principle.